Flying head read/write characteristics using a monolithically integrated laser diode/photodiode at a wavelength of 1.3 μm
- 1 July 1991
- proceedings article
- Published by SPIE-Intl Soc Optical Eng
- p. 248-262
- https://doi.org/10.1117/12.45950
Abstract
A feasibility study is shown for an optical disk drive using an optically switched laser (OSL) flying head. This head consists of an AlN slider and 1.3-micrometers wavelength InGaAsP laser diode monolithically integrated with a photodiode. The laser diode has a taper-ridged waveguide on the top of the facet facing the recording medium. The disk consists of an SiN dielectric protective layer, an SbTe Ge recording medium, and 1.5-micrometers -track pitch sampled servo format pits on the glass substrate. The lensless near-field flying head gives excellent read/write performance and head/medium reliability: a high-quality readout SNR of 35 dB, stable write operation with 16 mW of laser power, and a lifetime of 4.4 X 108 passes under experimental room conditions.Keywords
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